Seven's transformation sequences, especially the full-length version (as in Episode 4).
When Alien Bell incapacitated Dan with its signature sound, Dan just waved his arms in front of his chest and transformed without the benefit of the Ultra Eye.
The Ultra Garrison's Big Damn Heroes moment in Episode 40 when they used the Magma Raider to rescue Seven.
Seven's attack in Episode 22, with the Ultra Garrison's help.
In the "Westward, Ultra Garrison" two parter the first half ends with a cliff hanger...Ultraseven on the ropes against the Peetan's combining robot! That's one for the antagonist but another awesome moment is when the Ultra Garrison returns the favor with Ultraseven giving help.