When Worlds Collide (Numbers)
episode of Numbers (S4 E18)

"When Worlds Collide" is the 18th episode and the season finale of the fourth season of the American television show Numbers. In the episode, two brothers, one a Federal Bureau of Investigation (FBI) Special Agent and the other a mathematician, disagree with each other on the issue of academic freedom after one of the mathematician's friends is arrested on terrorism charges. Series creators Cheryl Heuton and Nicolas Falacci, who wrote the episode, first mentioned the idea for the brothers' conflict during a season two commentary. When Heuton and Falacci wrote the episode for season four, their episode launched a story arc that was later resolved during season five.
"When Worlds Collide" first aired in the United States on May 16, 2008. Critics gave the episode positive reviews. One called the episode "intense" while another called it "game-changing". In addition, this episode also marks the final appearance of Megan Reeves.
Plot summary
Two men are kidnapped . Meanwhile, in front of Drs.
The public source identifies “When Worlds Collide (Numbers)” as episode of Numbers (S4 E18). This brief keeps that definition visible, then builds a research path around When, Worlds and Collide.
Why this record matters
A short description can identify a subject without explaining its stakes. For “When Worlds Collide (Numbers)”, the useful work is to connect “episode of Numbers (S4 E18)” to the records capable of establishing context and consequence.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jul 17, 2026. The linked authority identifier is Q7992829. None of the 1 selected statements returned an explicit reference. The first chronological checks are 2008.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “When Worlds Collide (Numbers)”, its source revision and the description used here.
- Expand the search: follow When Worlds Collide (Numbers) primary sources, When Worlds Collide (Numbers) archive and When research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “When Worlds Collide (Numbers)”?
- Which institution is responsible for the underlying evidence?
- What terminology or title could unlock a more precise catalogue search?
Search terms from this dossier
This entry incorporates text from “When Worlds Collide (Numbers)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.