Aberdeen have announced the capture of Chris Clark and the loan signing of Manchester City goalkeeper David Gonzalez.
Clark returns to Pittodrie on a three-year contract after leaving for Plymouth in a £200,000 deal in January 2008.
Gonzalez, meanwhile, has signed a six-month loan deal after spending the end of last season with Championship side Leeds.
Clark, who signed his deal on Wednesday morning, began his career with the Dons in 1997, making 235 appearances and scoring 11 goals in his first spell with the club.
He said on the club's official website, www.afc.co.uk: "It's been a difficult time at Plymouth recently with their off-the-field problems but I feel I'm a better player for the experience.
"I know other clubs were interested but the family love it in the north east and it's fantastic to see so many familiar faces."
Aberdeen manager Craig Brown was thrilled to sign Clark as his second summer signing.
He said: "I remember him from his original time at Aberdeen and I remember that is he is a very good player. His availability was too good an opportunity for us to refuse so we are delighted he has committed himself to Aberdeen.
"His versatility is the main attribute he has. He is able to play in a number of different positions. He is a very fit guy and a very good professional. He will be a great addition to the squad."
Brown's capture of Clark was swiftly followed by the signing of Gonzalez after the Dons received official clearance for the player. The Columbia international goalkeeper had spells in South America and Turkey before moving to Manchester City in January 2010.