Mighty Avengers #21
The Mighty Avengers was the official Avengers group formed during the 50 state initiative following Civil War, but in the era of Dark Reign, things have changed. This issue starts a new story arc with a new writer and a new roster, and as such, is mostly a recruitment-oriented story. Sasquatch appears as a regular member of Omega Flight in one panel.
During a series of worldwide catastrophic events dubbed “The Chaos Cascade”, The Scarlet Witch (really Loki) recruits several members to join the new Mighty Avengers, one of which was supposed to be Captain America (Bucky Barnes). Unfortunately, he got himself killed by evil spikey eye-poking vines that manifested as a result of the Chaos Cascade. Her second choice is USAgent, naturally, recruited right out from an attack of evil flesh-eating insects in downtown Toronto, where quondam Omega Flight teammates Arachne, Weapon Omega and Sasquatch are killed.
The events of the Chaos Cascade were too globally destructive and overwhelmingly mischievous for the reader to believe that its effects would last: Spidey, Cap, Ms. Marvel and Ronin die; New York, San Francisco and Atlantis are destroyed; the reader just knows these effects are temporary. Meanwhile, the very presence of the Scarlet Witch lends itself to a general feel of “alternate reality”, and sure enough, by issue #23, the effects are reversed.
Note the roster change for Omega Flight: USAgent is removed, but not before Dan Slott took two pages to have the Scarlet Witch insult him as being a B-list replacement for Captain America.