Allan, 18, was acquired Monday from Medicine Hat in exchange for a fifth-round selection in the 2016 Bantam Draft. In 34 games during his rookie season for Medicine Hat last year, Allan had no points and 24 penalty minutes.
Spencer, 17, joins the Thunderbirds from the Minnesota NW team in the Upper Midwest High School Elite team. With Minnesota NW, Spencer had posted four goals and six assists in 21 games, he also had 30 penalty minutes. In 2012-13, Spencer played for Champlin Park High School in Minnesota and finished with seven goals and 13 assists in 25 games.
Forwards Mathew Barzal and Keegan Kolesar join defenseman Ethan Bear, all currently on the T-Birds roster, as selections for the week-long tournament held in Cape Breton, Nova Scotia from December 29-January 4th, 2014.
In the acquisition of Henry, the Thunderbirds will send Griffin Foulk to the Hurricanes.
Seattle landed Adam Kambeitz from the Saskatoon Blades and Andrew Johnson from the Moose Jaw Warriors on Thursday.