- Team X (First full appearance) (Only in flashback)
- Weapon X Program (Only in flashback)
- Omega Red (Arkady Rossovich) (Only in flashback)
- Jebediah Creed (First appearance) (Only in flashback)
Wolverine discovers everything about his past life in the government program Weapon X was a lie... including his love affair with Silver Fox.
- This episode along with "The Juggernaut Returns" and "Nightcrawler" were originally scheduled to be part of season four; however, animation problems on other episodes led to these episodes being moved earlier in the slate.
- Silver Fox's flying vehicle has the skull-squid symbol of the Marvel Comics villain group HYDRA, which also explains her costume: she's a member of them now.
- This episode is loosely based on Wolverine (Vol. 2) #48–#50 with portions of Wolverine (Vol. 2) #61–#64 as well.
After Jean Grey's apparent death in Dark Phoenix saga part 4, this is the 1st appearance of Jean. Furthermore no explanation is given to Jean's return. A reason could be that the series neglected to mention that the Jean we saw die was just a clone, as in the comics Jean was cloned several times.
- The "Professor"'s video logs have the dates of October 17 and November 3, 1973.